Radiator cover... Use is or not?

[saskboy]

Its about 3 or 4 degrees Celcius here and im running mine, it wont keep quite at operating temp on the highway without it.

[fishpredator07]

Never used the cover. Usually its 4wd that kills the mileage, not the temp for me. That and stop and go traffic. Just be sure you let it warm up before tearing off. My tranny wouldn't like a premature extrication.